bashScriptCollection/removeDiskInAnRAID5.sh at master · framps/bashScriptCollection · GitHub

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#!/bin/bash

# POC to verify it's possible to remove a disk from a RAID5 and not to force a RAID rebuild to prove it will work on a pure Linux.
# Given I have no spare synology NAS to test this on DSM that's how I verified it may work also on a Synology running DSM.
#
# Setup: Three devices with 3 partitions. md0 and md1 use partitions 1 and 2 as a RAID1. Partition3 is used in a RAID5.
#
# Steps:
# 1) Create the RAIDs
# 2) Create files in the RAIDs
# 3) Deactivate the RAID5
# ... remove disk /dev/sda ... and insert it again
# 4) Add the removed disk again to all RAIDs
# ... The two RAID1s are rebuilt because they were active when the disk was removed. The RAID5 is active immediately without any rebuild
#
# POC created by framp@linux-tips-and-tricks.de

case $1 in

    createRaid | 1)

        echo "*** Removing mdadm config"
        rm /etc/mdadm/mdadm.conf

        echo
        echo "*** Umounting RAIDs"

        umount /dev/md0
        umount /dev/md1
        umount /dev/md2

        echo
        echo "*** Wipe RAID partition"

        umount /dev/md0
        sudo wipefs --all --force /dev/md0
        umount /dev/md1
        sudo wipefs --all --force /dev/md1
        umount /dev/md2
        sudo wipefs --all --force /dev/md2

        echo
        echo "*** Stopping RAIDs"

        mdadm --stop /dev/md0
        mdadm --stop /dev/md1
        mdadm --stop /dev/md2

        echo
        echo "*** Wipe partitions"

        umount /dev/sda?
        sudo wipefs --all --force /dev/sda?
        sudo wipefs --all --force /dev/sda
        umount /dev/sdb?
        sudo wipefs --all --force /dev/sdb?
        sudo wipefs --all --force /dev/sdb
        umount /dev/sdc?
        sudo wipefs --all --force /dev/sdc?
        sudo wipefs --all --force /dev/sdc

        echo
        echo "*** Zero superblock"
        mdadm --zero-superblock /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sda3 /dev/sdb3 /dev/sdc3

        echo
        echo "*** Allocate partitions"

        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:dsm /dev/sda
        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:swap /dev/sda
        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:sp /dev/sda
        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:dsm /dev/sdb
        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:swap /dev/sdb
        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:sp /dev/sdb
        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:dsm /dev/sdc
        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:swap /dev/sdc
        sgdisk -n 0:0:+1GiB -t 0:8300 -c 0:sp /dev/sdc

        echo
        echo "*** Creating RAIDs"

        yes | mdadm --create --verbose /dev/md0 --level=1 --raid-devices=3 /dev/sd[a-c]1
        yes | mdadm --create --verbose /dev/md1 --level=1 --raid-devices=3 /dev/sd[a-c]2
        yes | mdadm --create --verbose /dev/md2 --level=5 --raid-devices=3 /dev/sd[a-c]3

        echo
        echo "*** Formating RAID"

        yes | mkfs.ext4 -m 0 -E lazy_itable_init=0,lazy_journal_init=0 /dev/md0
        yes | mkfs.ext4 -m 0 -E lazy_itable_init=0,lazy_journal_init=0 /dev/md1
        yes | mkfs.ext4 -m 0 -E lazy_itable_init=0,lazy_journal_init=0 /dev/md2

        cat /proc/mdstat
        exit
        ;;

    createFiles | 2)

        echo
        echo "*** Persisting mdadm config"
        mdadm --detail --scan --verbose | sudo tee -a /etc/mdadm/mdadm.conf

        echo
        echo "*** Creating mount points"
        mkdir /mnt/md0
        mkdir /mnt/md1
        mkdir /mnt/md2

        echo
        echo "*** Mounting RAIDs"

        mount /dev/md0 /mnt/md0
        mount /dev/md1 /mnt/md1
        mount /dev/md2 /mnt/md2

        echo
        echo "*** Creating files"

        echo "DSM" > /mnt/md0/DSM
        echo "SWAP" > /mnt/md1/SWAP
        echo "SP" > /mnt/md2/SP
        ls /mnt/md*
        exit
        ;;

    deactivateSP | 3)

        echo
        echo "*** Deactivate /dev/md2"
        umount /dev/md2
        mdadm --stop /dev/md2
        cat /proc/mdstat
        exit
        ;;

    readdDevice | 4)

        echo
        echo "*** Readd missing device"
        mdadm --manage /dev/md0 -a /dev/sda1
        mdadm --manage /dev/md1 -a /dev/sda2
        mdadm --manage /dev/md2 -a /dev/sda3
        mdadm --assemble /dev/md2
        mdadm --readwrite /dev/md2
        ls /mnt/md*
        cat /proc/mdstat
        exit
        ;;

    *)
        echo "Available commands"
        echo "createRaid|1"
        echo "createFiles|2"
        echo "deactivateSP|3"
        echo "readdDevice|4"
        exit
        ;;
esac